Rigid expanded polyurethane foam (REPF)
This product is available in both
sheet form (to order) or liquid (2 part), unlike polystyrene REPF can be
used in contact with polyester resin and is often employed as an
insulation material from heat or cold and also filling cavities for
buoyancy and water ingress prevention.
The liquid form is available in two densities High & low, the high density
foam is used as a cavity filler where great strength is required also used
to cast blocks for carving, sanding and machining when making mould
masters/plugs etc, main uses include automotive body parts wings, sills,
bumpers, aerofoils, skirts etc. Both densities can be used for casting in
moulds and when its expanding in a confined space forms a skin and
produces a smooth shiny surface.
Low density foam is used mainly for filling buoyancy
chambers in boats but also produces a very effective insulation barrier,
expanding in ideal conditions to approx 20-24 times its original volume.
Spec and mixing guide sheets are available here